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Ordering number : ENA1448
Bi-CMOS LSI
LV5747TT
Overview
1-channel Step-down Switching Regulator
The LV5747TT is a 1-channel step-down switching regulator.
Functions
* 1 channel step-down switching regulator controller. * Frequency decrease function at pendent. * Load-independent soft start circuit. * ON/OFF function. * Built-in pulse-by-pulse OCP circuit. It is detected by using ON resistance of an external MOS.
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter supply voltage VIN, SW HDRV, CBOOT Allowable pin voltage LDRV Between CBOOT to SW, Between CBOOT to HDRV EN, ILIM Between VIN to ILIM VDD SS, FB, COMP Allowable Power dissipation Junction temperature Operating temperature Storage temperature Pd max Tj max Topr Tstg Mounted on a specified board. * VIN+0.3 1.0 6.0 VDD+0.3 0.75 150 -40 to +85 -55 to +150 V V V V W C C C Symbol VIN max Conditions Ratings 45 45 52 6.0 6.0 Unit V V V V V
* Specified board: 35mm x 32mm x 1.6mm, glass epoxy 2-layer board.
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment.
42209 MS 20090402-S00001 No.A1448-1/5
LV5747TT
Recommended Operating Ranges at Ta = 25C
Parameter Supply voltage range Error amplifier input voltage Symbol VIN VFB Conditions Ratings 8.0 to 42 0 to 1.6 Unit V V
Electrical Characteristics at Ta = 25C, VIN = 12V
Parameter Reference voltage block Internal reference voltage 5V power supply Vref VDD Including offset of E/A IOUT = 0 to 5mA 0.698 4.7 0.708 5.2 0.718 5.7 V V Symbol Conditions min Ratings typ max Unit
Triangular waveform oscillator block Oscillation frequency Frequency variation Oscillation frequency fold back detection voltage Oscillatory frequency after fold back ON/OFF circuit block IC start-up voltage start-up voltage hysteresis Soft start circuit block Soft start source current Soft start sink current Soft start end voltage UVLO circuit block UVLO lock release voltage UVLO hysteresis Error amplifier Input bias current Error amplifier gain Common mode input range Sink output current Source output current Current detection amplifier gain over current limiter circuit block Reference current Over current detection comparator offset voltage Over current detection comparator common mode input range PWM comparator Input threshold voltage Vt max Vt0 Maximum ON duty Output block Output stage ON resistance (the upper side) Output stage ON resistance (the under side) Output stage ON current (the upper side) Output stage ON current (the under side) The whole device Standby current Mean consumption current ICCS ICCA EN < 1V EN > 4.3V 3.3 60 A mA IONL 240 mA IONH 240 mA RONL 5 RONH 5 DMAX Duty cycle = DMAX, SW = VIN Duty cycle = 0%, SW = VIN 1.0 0.4 85 1.1 0.5 90 1.2 0.6 95 V V % VIN-0.45 VIN V ILIM VLIM OFS -10% -5 20 +10% +5 A mA IEA IN GEA VEA R IEA OSK IEA OSC GISNS VIN = 8 to 42V FB = 1.0V FB = 0V 1000 0.0 -100 100 1.3 1400 100 1800 1.6 nA A/V V A A VUVLO VUVLO H 7.0 7.4 0.6 7.8 V V ISS SC ISS SK VSS END EN > 4.3V EN < 1V, VDD = 5V 0.9 4 5 2 1.1 1.3 6 A mA V VEN on VEN hys VIN = 8 to 42V 1.0 3.4 1.2 4.3 V V FOSC FB VFB = 0V 25 45 60 kHz FOSC FOSC DV VOSC FB VIN = 8 to 42V FB voltage detection after SS ends 335 385 1 0.5 435 kHz % V
No.A1448-2/5
LV5747TT
Package Dimensions
unit : mm (typ) 3375
1.0
Pd max -- Ta
Specified board: 35x32x1.6mm3 glass epoxy 2-layer board.
3.0 12
Allowable power dissipation, Pd amx -- W
0.8 0.75
0.6
3.0
4.9
0.5
0.4 0.36
12 (0.25) 0.5 0.2
(0.85) 1.1 MAX
0.125
0.2
0 -40
-20
0
20
40
60
8085
100
Ambient temperature, Ta -- C
SANYO : MSOP12(150mil)
Pin Assignment
FB 1 COMP 2 EN 3 12 SS 11 ILIM 10 VIN 9 GND 8 VDD 7 LDRV Top view
0.08
LV5747TT
SW 4 CBOOT 5 HDRV 6
No.A1448-3/5
LV5747TT
Block Diagram
VIN 10
5V REGULATOR REFERENCE VOLTAGE TSD UVLO
ILIM 11
20A
OCP Comp VCC
5A
SD
1.1V
+ - SD
SS 12 FB 1 COMP 2
0.7V
+ + + -
fosc forced 1/8
PWM Comp
0.5V
FFOLD Comp
Pin Function
Pin No. 1 Pin name FB Description Error amplifier reverse input pin. By operating the converter, the voltage of this pin becomes 0.708V. The voltage in which the output voltage is divided by an external resistance is applied to this pin. Moreover, when this pin voltage becomes 0.5V or less after a soft start ends, the frequency fold back function operations, and the oscillating frequency is falling with the FB voltage. 2 3 4 5 6 7 8 9 10 COMP EN SW CBOOT HDRV LDRV VDD GND VIN ILIM Error amplifier output pin. Connect a phase compensation circuit between this pin and GND. ON/OFF pin. Pin to connect with switching node. The source of NchMOSFET connects to this pin. Bootstrap capacity connection pin. This pin becomes a GATE drive power supply of an external NchMOSFET. Connect a bypath capacitor between CBOOT and SW. An external the upper MOSFET gate drive pin. An external the lower MOSFET gate drive pin. Power supply pin for an external the lower MOS-FET gate drive. Ground pin. Each reference voltage is based on the voltage of the ground pin. Power supply pin. This pin is monitored by UVLO function. When the voltage of this pin becomes 7.8V or more by UVLO function, The IC starts and the soft start function operates. 11 Reference current pin for current detection. The sink current of about 20A flows to this pin. When a resistance is connected between this pin and VIN outside and the voltage applied to the SW pin is lower than the voltage of the terminal side of the resistance, the upper NchMOSFET is off by operating the current limiter comparator. This operation is reset with respect to each PWM pulse. 12 SS Pin to connect a capacitor for soft start. A capacitor for soft start is charged by using the voltage of about 5A. This pin ends the soft start period by using the voltage of about 1.1V and the frequency fold back function becomes active.
+ -
+ + Current Amp SQ R SAW WAVE OSCILLATOR
SQ R
5 CBOOT 6 HDRV DMAX = 90%
1.1V 0.5V
4 SW
CONTROL Logic 5V
8 VDD 7 LDRV 9 GND
shut down(SD)
3 EN
No.A1448-4/5
LV5747TT
Sample Application Circuit
VIN = 8 to 42V C1 C7 10 VIN R5 C6
11 ILIM CBOOT 5 HDRV 6
C2 Q1 L OUT Q2 D2 R4 C4 C9 D1 R3 C8 C10
ON/OFF
3 EN 12 SS 2 COMP C5 R2 GND 9 C3 C11
SW 4 LDRV 7 FB 1 VDD 8
R1
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This catalog provides information as of April, 2009. Specifications and information herein are subject to change without notice. PS No.A1448-5/5

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